References to Draft API In Documentation

[philipc2]

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We have retired our draft API in favor of using Github issues, so references to the Draft API should be updated accordingly in the documentation.

https://uxarray.readthedocs.io/en/v2023.03.0/api.html

https://uxarray.readthedocs.io/en/v2023.03.0/contributing.html#project-specific-resources

https://uxarray.readthedocs.io/en/v2023.03.0/contributing.html#project-specific-resources:~:text=UXarray%20draft%20API%20entries%2C

https://uxarray.readthedocs.io/en/v2023.03.0/contributing.html#project-specific-resources:~:text=Please%20also%20ensure%20that%20you%20are%20changing%20the%20UXarray%20draft%20API%20accordingly%20if%20you%20are%20proposing%20changes%20to%20the%20API%20(e.g.%20new%20functions/attributes%2C%20modification(s)%20to%20existing%20functions%2C%20etc.)

There may be a few other references that I've missed.